Alcatel 1935 LMI
High power CW laser
C and L bands
With integrated wavelength monitoring
Description
The Alcatel 1935 LMI contains an
Alcatel SLMQW DFB laser and is
designed for use with external
modulation. This module is
designed to high power DWDM
applications with a spacing
between the channels down to
50 GHz without using external
locker. The module integrates a
wavelength monitoring function in
order to allow wavelength
stabilization over product lifetime.
Despite of this new feature, the
package and the pinout of the new
product stays compatible with the
previous series (Alcatel 1905LMI)
without the integrated wavelength
monitoring function, in order to
avoid a complete redesign of
existing boards. The choice of an
analog output for the control signal
will leave the freedom for the user
to lock the wavelength either with a
digital or an analog circuit.
The module incorporates also a
polarization maintaining fiber
pigtail, thermoelectric cooler,
precision thermistor, and optical
isolator for stable operation under
all conditions.
Features
•
•
•
•
Integrated Fabry-Perot Etalon
wavelength monitoring
(replaces external lockers)
Up to 20mW output power
50 GHz channels spacing
available
High reliability InGaAsP Buried
Ridge Structure laser chip with
outstanding long term
wavelength stability
Optimized for use with LiNbO3
external modulator
Internal optical isolator
Internal TEC and power
monitoring photodiode
Polarization Maintaining Fiber
PMF pigtail
•
•
•
•
Applications
•
•
•
Ultra Long Haul DWDM
SONET/SDH transmission
system
DWDM submarine terminal
Instrumentation
Electro-Optic Characteristics
Parameter
Threshold current
Optical output power
Laser forward voltage
Laser forward current (BOL)
Laser chip temp. range for
wavelength tunability
Spectral width
Side mode suppression
TEC current
TEC voltage
Thermistor resistance
Thermistor temperature coefficient
Relative Intensity Noise
TE/TM fiber Extinction Ratio
Symb.
I
TH
P
F
V
F
I
F
Twave
∆λ
SMSR
I
t
V
t
R
TH
R
T
RIN
ER
Conditions
Twave= 15 to 35°C
@ P
F
; CW; pin 11 & 3
@ P
F
=10mW; pin 11 & 3
@ P
F
=20mW; pin 11 & 3
(2)
@ 10 mW; CW; FWHM
@ 20 mW; CW; FWHM
@ P
F
; CW
(1), EOL
(1), EOL
@ Ts = 25°C
100 MHz to 10 GHz @ P
f
15
Min
10
20
-
Max
40
Units
mA
mW
mW
V
mA
mA
°C
MHz
MHz
dB
A
V
k
Ω
%/K
dB/Hz
dB
2.5
120
190
35
10
5
35
1.3
2.5
10.3
-5
-140
9.7
-3
20
Note : all limits start of life (except It, Vt), Tsubmount=25°C, Tcase=25°C, Pf, V=-5V
(1) Tcase=70°C (for 10&20mW), Tsubmount=20°C, @1.2 P
F
(2) Twave is chip temperature required to meet target wavelength
Wavelength monitoring section
Two photodiodes are used to ensure both optical power monitoring and wavelength monitoring. The first one
(power monitoring) is referenced as monitoring photodiode (PD
mon
) whereas the second one (wavelength
monitoring) is referenced as filter photodiode (PD
filt
).
Symb.
Power Monitoring Photodiode current
Filter Monitoring photodiode current
Photodiodes dark current
Center wavelength
Wavelength stability over lifetime
Wavelength capture range
Wavelength deviation between adjacent ITU channels
Filter slope (normalized to maximum PD
filt
current)
Electrical responsivity ratio between power monitoring
channel and filter monitoring channel
I
PDmon
I
PDfilt
I
dark
λ
c
∆λ
c
CR
ε
λ
FS
ERT
Min
20
20
0.1
ITU grid
+2.5
0.1
2
±6
Max
Unit
µA
µA
µA
GHZ
GHz
GHz
nm
-1
dB
- 2.5
45
Absolute maximum ratings
Exposing the device to stresses above those listed in absolute maximum rating could cause permanent
damage. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Environmental
Parameter
Storage temperature
Operating temperature (for 10mW to 20mW versions)
Soldering temperature (10 seconds maximum)
Axial force on fiber ( 10 seconds max.)
Fiber bend radius
ESD (1) applied on PIN detector (Pin 4&5)
ESD (1) on other Pin
(1) Human body model
Min
- 40
-10
Max
85
70
260
5
Unit
°C
°C
°C
N
mm
30
100
2000
V
V
Electro-optic
Parameter
Laser forward current
Laser reverse voltage
Photodiode forward current
Photodiode reverse voltage
Thermistor Voltage
Thermistor Current
TEC Voltage
TEC Current
Packing Mounting Torque
Min
Max
400
2
1
20
9
250
2.8
1.4
0.2
Unit
mA
V
mA
V
V
µA
V
A
Nm
All dimensions in mm
20.8
Rigid 31,5
Optical fiber length 0.8 m
i
1.78
9.8
5.6
30
2
26
ø5.6
ø5.3 maxi
ø0.9
6
Keyed FC/PC
connector
2 x
φ
2.7
35 min
15.2 12.7 min
12.7
9
5.95
1.25
1.85
14x(0.5x0.2±0.06)
6x2.54
1.48
17.84
Pin allocation
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Description
Thermistor
Thermistor
LD DC Bias (-)
Power Monitoring PD Anode (-)
Common Power Monitoring and
λ
Monitoring PD Cathode (+)
TE Cooler (+)
TE Cooler (-)
Case Ground
Case Ground
λ
Monitoring PD anode
RF common (+)
Laser RF input (-)
RF common (+)
No Connect
Pin#1 is the top-rigth one on the laser module top view
Ordering information
Alcatel 1935 LMI
Nominal power
10 mW
20 mW
Connector type
FC/PC
FC/PC
Part number [1]
3CN 00412 ##AA
3CN 00413 ##AA
## defines the wavelength and the connector according to the following table .
λ
THz
Connector
FC/PC
λ
THz
Connector
FC/PC
1528,77
1529,16
1529,55
1529,94
1530,33
1530,72
1531,12
1531,51
1531,90
1532,29
1532,68
1533,07
1533,47
1533,86
1534,25
1534,64
1535,04
1535,43
1535,82
1536,22
1536,61
1537,00
1537,40
1537,79
1538,19
1538,58
1538,98
1539,37
1539,77
1540,16
1540,56
1540,95
1541,35
1541,75
1542,14
1542,54
196,10
196,05
196,00
195,95
195,90
195,85
195,80
195,75
195,70
195,65
195,60
195,55
195,50
195,45
195,40
195,35
195,30
195,25
195,20
195,15
195,10
195,05
195,00
194,95
194,90
194,85
194,80
194,75
194,70
194,65
194,60
194,55
194,50
194,45
194,40
194,35
BM
BN
BP
BQ
BR
BS
BT
BU
BV
BW
BX
BY
BZ
CA
CB
CC
CD
CE
CF
CG
CH
CJ
CK
CL
CM
CN
CP
CQ
CR
CS
CT
CU
CV
CW
CX
CY
1542,94
1543,33
1543,73
1544,13
1544,53
1544,92
1545,32
1545,72
1546,12
1546,52
1546,92
1547,32
1547,72
1548,11
1548,51
1548,91
1549,32
1549,72
1550,12
1550,52
1550,92
1551,32
1551,72
1552,12
1552,52
1552,93
1553,33
1553,73
1554,12
1554,54
1554,94
1555,34
1555,75
1556,15
1556,55
1556,96
194,30
194,25
194,20
194,15
194,10
194,05
194,00
193,95
193,90
193,85
193,80
193,75
193,70
193,65
193,60
193,55
193,50
193,45
193,40
193,35
193,30
193,25
193,20
193,15
193,10
193,05
193,00
192,95
192,90
192,85
192,80
192,75
192,70
192,65
192,60
192,55
CZ
DA
DB
DC
DD
DE
DF
DG
DH
DJ
DK
DL
DM
DN
DP
DQ
DR
DS
DT
DU
DV
DW
DX
DY
DZ
EA
EB
EC
ED
EE
EF
EG
EH
EJ
EK
EL
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